Audio Signal Processing Apparatus, Audio Signal Processing System, and Audio Signal Processing Method

2. The audio signal processing apparatus according to claim 1, wherein the window processing part performs the window processing by convolving a first function obtained by performing a DFT on the window function and the frequency data.

3. The audio signal processing apparatus according to claim 1, wherein the window function is formed by a linear combination of the seventh order trigonometric function.

4. The audio signal processing apparatus according to claim 1, wherein the second converting part normalizes a data value of the window function using a maximum value, and then calculates the data of the time-axis data sequence by setting the delay parameter m to be a value of n such that the data value h(n) of the window function becomes 0.8 or more.

5. The audio signal processing apparatus according to claim 1, wherein the delay parameter m is set to be an integer value obtained by multiplying the number of data points N by a ratio of equal to or more than 10% and less than 30%, and the window function is formed such that, a data value h(0) of a head of a window and a data value h(N−1) of a tail of the window are 0 when the data value of the window function is normalized by the maximum value, and a data value h(m) at a position shifted from the head to the tail by the delay parameter m is 0.8 or more.

6. The audio signal processing apparatus according to claim 1, wherein the signal processing performed by the signal processing part includes at least one of noise reduction processing or howling reduction processing.